Improvement in steam-boilers



3 Sheets--Sheet1.

G. H. HASW ELL.

Steam-Boilers.

Patented May 26,1874.

Jigl.

OOOOMOOO INVENTUB a ATTORNEYS.

3 Sheets--Sheet 2.

C. H. HASWELL Steam-Boilers.

Patented May 26,1874.

OGOCOOOO 000 OM00 000$ 00 No.l5l,284.

INVENTOB l 5 %@M% moans.

S'Sheets Sheet 3.

G. H. HASWELL.

Steam-Boilers.

Pate'nted'May 26,1874;

N0.l5l,284.

WITNESSES UNITE TATES CHARLES H. HASYVELL, OF NElV YORK, N. Y.

IMPROVEMENT 1N STEAM-BOILERS.

Specification forming part of Letters Patent No. 15L8L dated May $6,1874; applicai'ion'filed April 4, 1874.

CASE A.

To all whom it may concern:

Be it known'tliat I, CHARLES-H. HAswELL, of New York city, in the countyand State of New York, have invented certain new and useful Improvementsin Steam-Boilers, of which the following is a specification:

The design of this boiler, and the nature of my invention, consist of aconstruction of round-shell furnaces, lower fines, and arched uptake orvertical smoke-connectionalso, arched horizontal smoke-connections, sofar as the same may be practicable of attainmen tin order to offer thegreatest resistance to rupture with the least material, and with theleast practicable resort to braces, combined with economy of weight,cost, and increased endurance.

In steam-boilers of ordinary design, having either overhead return-tubesor tubes directly in line with their furnace, and all set in thelongitudinal plane of the boiler, it is very (lifticult to so proportiontheir diameter as to meet the several requirements of transverse area,

heating-surface, and diameter proportionate to their length, and toaccommodate the necessary steam-space; the cause of this difficultyarising from the circumstance that the area of the grate-bars beinggiven, and being a positive and unalterable element for an assigned orrequired capacity of boiler, the diameter of the shell, the transversearea of the tubes, the height of the furnace and steam-chamber, and theproportionate length of the tubes to their diameter, are all imperativein their requirements, and cannot be restricted without impairing theoperation of the boiler.

My improved boiler is represented in longitudinal sectional elevation inFigures 1 and 2, in horizontal section in Fig. 3, transverse section andend elevation in Fig. 4, and transverse section in Fig. 5.

A is the shell of the boiler; B, furnaces; 0, lower flues; D,connecting-fines; E, outside, upper, or overhead return smokeeonnectionsF, middle overhead connection; G, tubes connecting return-connections orflues E F; J,

lining to steam chimney, and forming uptakes; and I, diaphragm in theoutside fines, In Fig. l the steam-chimney is arranged at a pointbetween the ends, and the diaphragm l is employed in this arrangement tocause some of the heat, which would otherwise escape (lirectly to thesmoke, tofirst traverse the length of the flue E. The tubes G may behorizontal, as in Fig. 4, and the middle flue may have vertical sides,while the side flues E have one vertical side, as in Fig. 4, but themorepreferable arrangement will be as in Fig. 5, the tubes (lescending fromthe middle flue, whose sides converge to a point below its bottom, andconnect with correspondinglyinclined sides of tubes E. The flue F willbe wider than the length of tubes G, to allow of putting in the tubesfrom the fines. By this arrangement of fire-tubes the transverse arearequired by the area of gratesnrface, the area of their heatingsurface,and the volume of the steamchamber above, can all be obtained withoutprejudice to the height of the furnace below, and without involving animpracticable length of boiler.

In an .ordinary tubular boiler, when the tubes are set in itslongitudinal plane, it is impracticable to remove them and substituteothers without afi'ordingsufficient length for their withdrawal in thefire-room. By this arrangement of flues and fire-tubes the tubes can beremoved and replaced at pleasure, and all the necessary work prosecutedwithin the boiler. By the design of setting the tubes at an inclination,not only is the passage of the heated air and smoke facilitated, but thetubes are rendered less liable to become choked by the aggregation ofsoot and ashes cemented by the moisture from leaks, added to whichgreater space is afforded in the central flue for the manual operationof withdrawing and replacing any tubes that may require such operation.

In the ordinary overhead single return tubular or flue boiler, thesmoke-pipe must be placed at the extreme of the furnace end of theboiler, and, even in the drop-flue or tubular boiler, re-

turned on a level with the crown of the furnace. The smoke-pipe must beeither at the extreme back end of the boiler or immediately behind I thefurnace. No deviation from these fixed points is practicable. By theintroduction of a vertical diaphragm, I, in the return-flue or fiues ofa steam -boiler of this or like design, as here shown, the products ofcombustion can be so directed as to admit of the base of the smoke-pipebeing located at any portion of the length of the boiler,thus enablingthe constructor of a steam-vessel to locate the smoke-pipe'as may suithis convenience as to its position with reference to the masts, orsails, or passage-ways of a steam-Vessel.

I do not submit a round shell or furnace as a novelty, but I do submitthat arched smokeconnections are novel, that they afi'ordthe requiredstrength without braces, and that the under and inner surfaces of theconnections will serve the very useful and desirable purpose of being areceptacle for ashes, instead of their choking up the lower tubes, as inall other designs of tubular boilers. I do not submit fire-tubes settransversely to the longitudinal plane of a boiler as a novelty, as theywere so placed in the two instances of the steamer Kamschatka andferryboat Essex in this country, and by Hepworth and Miller in England,but they were confined to the furnace alone, and led directly from it toonly one rectangular connection in the first cases, and to the furnacein the others, and in neither of these cases were the tubes set at aninclination; but I do submit that they have never been so placed at aninclination, or even horizontal, in connection with an overhead returnside and center connections or flues, as

shown, whereby any required amount of trans verse area ofheating-surface can be obtained by simply adding to the length of theboiler. Further, I submit that a design of boiler, where both inclinedand horizontal tubes, set in the manner shown, can be removed andreplaced within the boiler, is novel. I further submit that althoughhorizontal diaphragms, and even vertical diaphragms, have been placed ina boiler, yet that they were for the purpose of duplicating or divertingthe passage of the products of combustion, but that in this design it isintroduced for the very different purpose of dividing the products, soas to enable the chimney to be placed where required.

What I claim as new, and desire to secure by Letters Patent, is-

1. The vertical smoke-connection or uptake of a steam-boiler constructedwith arched sides and ends. I l

2. The combination of tubes Gr with fiu'es E F, constructed and arrangedas and for the purpose described.

3. The diaphragm I, arranged in flues E to divide the products ofcombustion, in the manner specified.

4. A horizontal or inclined center-flue or heat and smoke connection ofa steam-boiler, with its sides converging to a center external thereto,in combination with the tubes G and side flues E, substantially as andfor the purpose specified.

CHAS. n. HASWELL.

Witnesses:

T. B. MOSHER, ALEX. F. ROBERTS.

